WiredTiger 2.9.1发布，MongoDB存储引擎

MongoDB 存储引擎 WiredTiger 2.9.1 发布了。WiredTiger 2.9.1 版本包含新功能，新的支持平台，次要 API 更改和错误修复。有关详细信息，请参阅更改日志。

新功能和 API 更改（有关完整详细信息，请参阅 API 文档）：

• SERVER-26545 Remove fixed-size limitation on WiredTiger hazard pointers. See the upgrading documentation for details

• WT-283 Add a new WT_SESSION::alter method that can be used to reconfigure table metadata

• WT-2670 Change the default file system access pattern advice for data files from random to no advice. Add access_pattern_hint configuration option for WT_SESSION::create API that can be used to advise the file system of expected access semantics. See the upgrading documentation for details.

• WT-3034 Add support for including updates when reading from named snapshots

重大变更和错误修复：

• WT-2960 Reduce likelihood of using the lookaside file, especially when inserting multi-megabyte values

• WT-3056 Allow projected table and join cursors to use primary keys

• WT-3070 Fix a bug in search_near on indexes